Saw filing device



May 29, 1945- A. C. scHoEN SAW FILING DEVICE Filed June 11, 1943 sneets-sheet-l Im 'lfyzzs I N VEN TOR.

A'ITCI R N EYB May 29', 1945. i A. c. SCHQEN y 2,376,941

sAw FIL'ING DEVICEz Filed June 11, 1943 5 Sheets-Sheet 2 ATTORNEYS May 29, 1945 A. c. scHoEN 2,376,941

sAw FILING DEVICE Filed June 12bl 1945 r 5 Sheets-Sheet 3 74 70 56" /53 4X 4640 /Z I n /56 26 76 ,40 /341 IN VEN TOR.

ajmf@ ATTE R N EYB SAW FILING DEVICE l Filed June 11, 194s 5 sheets-she@ 4 IN V EN TOR.

ATTD R N EY.

May 29 1945 A. c. scHoEN SAW FILING DEVICE Filed June 1l, 1943 5 Sheets-Sheet 5 Algas? www/g ATI'U R N EYB Patented May 29, 1945 UNITED STATES PATENT oFFicE SAW August C. Schoen, Philadelphia, Pm

' Application June 11, 1943, Serial No. 490,510

6 Claims.

My invention relates to the art of sharpening saws, and has among its objects and advantages the provision of an improved saw filing device for hand saws and the like.

An object of my invention is to provide a sawl filing device embodying a clamp4 for xedly securing a hand saw, wherein novel means are incorporated for actuating the le at preselected angles with respect to the saw blade, and in which novel means are included for automatically shifting the le longitudinally of the saw blade to bring it in position for filing the next tooth.

Another object is to provide a saw ling device including means for guiding the file in a reciprocatory rpath for ling purposes, in which novel means are employed for elevating the ille upon its return stroke, and in which a toothed member is associated with a ratchet mechanism for shifting the ille from tooth to tooth, wherein the toothed member shifts the le in stages of two saw teeth at a time, with the toothed 'member detachably mounted to accommodate other toothed members of greater or less spacing for saws having diierent numbers of teeth per inch.

In the accompanying drawings:

Figure l is a top plan view of the invention;

Figure 2 is a view taken from the position indicated by line 2-2 of Figure 1;

Figure 3 is an end view of the device illustrating the greater portion of the saw blade clamp in position;

Figure 4 is a plan view of the ratchet mechanism;

Figure 5 is a similar View illustrating the shifting action of the ratchet mechanism;

Figure 6 is a bottom plan view of the ratchet mechanism;

Figure 7 is a sectional view illustrating the saw the shaft and actuation of the cams.

with the angles so spaced from the axis of the In the embodiment selected for illustration, a frame IIl is welded to the upper ends of supporting legs I2, and the frame supports a bedplate` I4 upon which the saw actuating mechanism is mounted. A shaft I 6 is rotatably journaled in two of the legs I2 and is provided with two cams shaft I 6 as to cause the cams I8 to pivot lthe clamp member against the saw blade when the shaft is rotated in one direction.

Upon the bedplate I4 is mounted a bar 32 which serves as a track or guide for a chuck bar 34 provided with a chuck 36 at one end for supporting the ille 38. Bar 32 is provided with three posts 40, 4I and 42 upon each side, with the chuck bar 34 located between the two sets of posts. 'Ihe chuck bar slides longitudinally of the bar 32. .Figures 7, 8 and 9 illustrate the bar 32 as being pivotally connected with the bedplate I4 through the medium of a bolt 44.

Each set of posts 40, 4I and 42 supports a rod 48, these bars being in parallelism and xedly secured by means of set screws 48 threaded into the posts 4I. Projecting laterally from the chuck bar 34 are four arms 50 slotted at 52 to receive the rods 4B, see Figure 11. These slots arey elongated vertically to permit vertical movement of the chuck bar 34 relatively to the rods 46, but the chuck bar is restrained from relative lateral movementV by reason of the snug -tting relationship between the walls oi the slots and rods.

Figures 1 and 2 illustrate a grip 54 secured to the chuck bar 34 through the medium of screws 56 passed through openings in a plate 58 and threaded into the chuck bar. Reciprocatory motion is imparted to the file 38 through manipulation of the grip 54. Figure 2 illustrates the position of the le 38 upon completion of its lling stroke, atwhich time two of the arms 50 engage the posts 42, respectively, to prevent further movement of .the chuck bar. Engagement between the other two arms 50 and the posts 40, respectively, limit travel` of thechuck bar ln the opposite direction.

'I'he chuck 38 includes a threaded shank .80

` threaded into an axial bore 62 in the chuck bar 2.` A i :,avaur 310 and is flxediy secured thereto by a set screw.

18. Thus the arm 14 aiIords support -for the end of the file opposite the chuck 38. Figures 7 and 9 illustrate the parallel relationship between the chuck bar 34 and the bar 32 `during the ling stroke, while Figure 8 illustrates the chuck bar 38 in its angular position for elevating the file 33 clear of the saw 28 during. the return stroke of the iile. During the ling stroke. the chuck tbar 34 is supported by the rods 48 through the medium of the arms 80. On the return stroke, the chuck bar 34 is supported at one 1 lend through engagement with thel bar 32 and at its other end ,by a finger 80. arranged to ride' on the bar 32. f

` A slot 82 is provided in the chuck bar 34 for loosely receiving the iinger 80. This nger is pivoted at 84 and extends a short distance beneath the chuck bar 34. In the position oi' Figure 7, which illustrates the foremost position of the file 38, the finger 80 pivots into a slot 84 in the bar 32. The finger is located closely to one wall of the slot 82 so as to have engagement with `the chuck bar 34, as at 88 in Figure 8, as the chuck bar 34 is moved rearwardly. The rounded end 88 of the finger 80 climbs easily when engaging the bar 32 for elevating the chuck bar 38. `Thus the nger 80 is pivoted beyond a dead center position and is supported in that position through its engagement with `the chuck bar'34 .during the return stroke of the chuck bar. As the chuck bar is moved rearwardly to its extreme position and advanced forwardly, the nger 80 is pivoted to the position of Figure 9, which causes the nger to pivot beyond a'dead centerA position `and permit the chuck bar to drop to the position shown. A sharp edge 90 is provided on the flnger I80 to eliminate slippage with respect to the bar 32 as the chuck bar 34 is advanced for the commencement of the filing stroke.

Since the bar 32 is pivoted on the bedplate I4, the le 38 may be adjusted to the desirable angle transversely of the saw 28. In Figures 1 and 10, `a curved member 92 is secured to the bar 32 by Qscrews 34, the bar 32 being provided with a transverse groove 98 to accommodate the member. A lbolt 08 extends through an opening |00 in the bedplate and through a slot |02 in the member 92. Slot |02 has a. curvature concentrically arranged with respect to the axis ofthe bolt 44, and the member 92 rests on the bedplate I4. Thus the bar 32 may be pivoted to'different angular posi-- tions and made secure in theA respective positions lby merely tightening'the nut |04 threaded on the best illustrated in Figure 9.

Ratchet pins and ||2 are slidably mounted `in tubes ||3 secured to the bottom'facej of the ratchet plate |08 through the medium of iianges `||4 riveted at ||8 to .the ratchet plate. Each `ratchet pin ||0 and ||2 is spring urged to bring `itstaperedendianyieldingwana toothedbar lll. Hgmes4,5and6illusiaatethe pinj||2 in engagement with the toothed bar H8 while the ratchet pin i il is in its retracted position. Each of the ratchet pins is provided with a projection |20 connected with one end of a tension spring |22 having its other end secured at |24 to the ratchet plate |08.- The projection |20 -of the ratchet pin H8 is in engagement with a pin |28 fixed to the ratchet plate |08 for holding the ratchet pin in its retracted position. The projection may be moved out of engagement with the pin |28 through slight rotation of the ratchet pin 0. A similarl pin |28 is provided for coaction with the projection |20 of the ratchet .pin H2.

The toothed bar I8 is detachabiy mountedon an angle |30 riveted to the frame I0. Screws |32 extend through slots |33 in the toothed bar ||8 and are threaded into the angle |30 for detachably mounting the toothed bar. All the teeth of the bar ||8 are inclined in the same direction. The pitch of the teeth of the bar |'I8 is twice that of the saw teeth, and the bar is reversed for ac commodating the two angular positions of the file 38 required to properly ille a saw.

Two pins |34 are secured to the ratchet plate |08 near its ends for selective connection with the eye las of a ratchet rod las. A plate un is secured -to the rear end of the chuck bar 34 and isprovided with slots |42 for selective reception of the ratchet rod |38. Figure 1 illustrates the ratchet rod |38 connected with one of the pins |34 and inserted in one of the slots |42, with the bar 32 in one of its angular positions, which properly aligns the file 32 with the saw blade 28.

For the position of the iile illustrated, the ratchet,

pin ||2 is spring pressed against the toothed bar H8.

Stops |44 and |48 are threadedly secured on the ratchet rod |38, with the plate |40 positioned between the two stops. At this time, the bar 32 is fixed against pivotal movement about the axis of the bolt 44. The stop |44 is so located on the ratchet rod |38 as to be engaged by the plate |40 as the chuck bar 34 approaches its extreme forward position. Such engagement between the plate |40 and the stop |44 imparts clockwise rotation to the ratchet plate |08, which shifts the ratchet pin 2 laterally sufliciently far to drop into the space behind the next tooth on the bar ||8. As the chuck bar 34 is moved in the rear- .ward direction, the plate |40 is brought intoengagement with the stop |48 as the chuck bar approaches its extreme rearward position. Such engagement between the plate |40 and the stop |48 exerts a pull on the ratchet rod |38 for imparting counter-clockwise rotation to the ratchet plate |08. Counter-clockwise rotation lof the ratchet plate causes the ratchet plate to advance relatively on the ratchet pin, which imparts slight pivotal movement to the ratchet pin, with the point of engagement of the ratchet pin with the toothed bar II8, which spacing intervals equal two saw teeth spaces. The toothed bar 8 is sufficiently long to accommodate the ordinary hand saw blade. Upon completion of one filing action, the toothed bar I I8 is reversed so that the teeth of the bar will be angled in the opposite direction. The bar 32 is pivoted to its other angular position, andthe eye |36 of the'ratchet rod |38 is inserted overK the other pin |34.` The ratchet rod is also slipped into the other slot |42, and the ratchet pin I I2 is secured in its retracted position and the ratchet pin III) is released for coaction with the toothed bar II8. Thus the bedplate I4 is moved laterally in the opposite direction for completing the final ling action. Since the spacing intervals are equal in both directions of lateral shift, the file 38 is merely positioned between two unfiled valleys in the saw blade so thatthe lateral shift of the bedplate I4 in the opposite direction will properly spaceI theme sa with respect te the unmea veueys er' the saw blade.

The slots |33 permit the toothed bar IIB to be precisely adjusted so as to accurately time the ratchet mechanism, particularly theY file, with respect to the saw teeth. To accommodate saws havingV different numbers of teeth per inch, a series of toothed bars is provided for the respective types of saws. and stops |44 and |46 are provided for each of the toothed bars employed so that the ratchet mechanism may be operated in accordance with the particular toothed bar in the machine. The stops |44 and |46 on each rod |38 are set to actuate the ratchet mechanism in accordance with the particular toothed bar to the end that the ratchet mechanism may be accurately `adjusted to the type of saw being handled.

Referring to Figure 2, the bedplate I4 is provided with two spaced flanges |50 which slidably embrace the flange |52 ef the'frame lo. Thus. the bedplate I4 is accurately guided during lateral shifting thereof in either direction. The opposite end of the bedplate rests on the flange |54 of the frame I0.

In order to facilitate placement of the saw 26 In addition, a ratchet rod |38 p rst diretion and acting thereon to shift said bedplate longitudinally of the toothed bar and .the

le two saw teeth upon pivotal mover/nent of the ratchet plate in said reverse direction.'

2. A saw filing device comprising'a support, a saw clamp on said support, a toothed bar paralleling the saw in said clamp and fixed on said support, a bedplate guided on said support for move-v ment longitudinally of said toother bar, a reciprocatory file support for supporting the file transversely of the saw, track means carried on said bedplate for guiding said file support, a ratchet in the vise structure, particularly with respect' to elevation in relation to the flle 3.8, a blade |56 is provided. This blade is secured to the angle 28 by screws |58.v The blade |56 is positioned in a notch in the saw adjacent one end thereof for determining the height of the saw at that end. It

' is then a relatively easy matter for the operator to visually gage the elevation of the saw at the other end of the vise, since the blade |56 constivsaw clamp on said support, a toothed bar paralleling the saw in said clamp and fixed on said support, a bed-plate guided on said support for movement longitudinally of said toothed bar, a reciprocatory file support for supporting the ville transversely of the saw, track means carried on said bedplate for guiding said file support, a ratchet plate pivoted on said'bedplate, a ratchet pin movably mounted on sadratchet plate and plate pivoted on said bedplate, a ratchet pin movably mounted on said ratchet plate and yieldingly urged against the teeth on the toothed bar. said ratchet pin being obliquely aligned with respect to said toothed bar, a ratchet rod pivotally connected with said ratchet plate and-having a lost motion connection with said file support for pivoting the ratchet plate in a first direction upon completion of the filing stroke ofthe file support and in a reverse direction upon completion of the ille retraction stroke of said flle support, said ratchet pin being shifted one tooth at a time with respect to said toothed bar by the pivotal movement of the ratchet plate in said rst direction and acting thereon to shift said bedplate longitudinally of the toothed bar and ,the ile two saw teeth upon pivotal movement of the ratchet plate in said reverse direction, and means acting on said track means and said le support for elevating the latter to lift the le clear of the saw during the le retraction stroke of the iile support and for dropping the file support upon reverse movement of the le support to bring the le into engagement with the saw.

3. A saw filing device comprising a support, a saw clamp on said support, a toothed bar parallellng the saw in saidclamp and xed on'said support, a bedplate guided on said vsupport for movement longitudinally of said toothed bar, a

' reciprocatory ille support for supporting the file transversely of the saw, track means carried on said bedplate for guiding said le support, a ratchet plate pivoted on said bedplate, a ratchet pin movably mounted on said ratchet plate and yieldingly urged against the teeth on the toothed bar, said ratchet pin being obliquely aligned with .respec't to said toothed bar, a ratchet rod pivotallyv connected with said ratchet plate and having a lost motion connection with said ille support for pivoting the ratchet plate in a first direction upon completion of the filing stroke of the ille support and in a reverse direction upon completion of the iile retraction stroke of said file support, said ratchet pin being shifted one tooth at a time with respect to said toothed bar by the pivotal movement of the ratchet plate in said rst direction and acting thereon to shift said bedplate longitudinally of the toothed bar and the ille two saw teeth upon pivotal movement of the ratchet plate in said reverse direcyieldingly urged against the teeth on the toothed tion, means acting on said track means and said ille support for elevating the latter to lift the ille clear of the saw during the ille retraction ,stroke o! the me support and for dropping the lille support upon reverse movement of the file `support to bring the nle into engagement with the saw, said track means belg pivotally mounted on said bedplate, means for xedly securing the track means in different angular positions on said lbedplate, said toothed bar having teeth inclined in one direction, a second ratchet pin on said ratchet plate'and obliquely aligned with respect to the toothed bar, said toothed bar being reversible to oppositely incline Athe teeth thereon for coaction with said second ratchet pin, and means `on said le support for operativelyI connecting the ratchet rod therewith when said second ratch- 1 et pin is active, said ratchet rod having a second `pivotal connection with the ratchet plate when `the second ratchet pin is active.

4. The invention as described in claim 3 wherein the means i'or elevating said le support comprises a pivoted pinl moveablev on one direction for acting on said track means.

5. The invention as described in claim 3 wherein the means for operatively connecting the ratchet rod with said ille support comprises a plate extending transversely of said support and provided with slots for recovering the ends of said ratchet rod. i

6. The invention as described in claim 3 wherein said ratchet rod is provided with stops for operation with said toothed bar in order that said ratchet mechanism can be adjusted for diierent types of saws. v

- AUGUST C. SCHOEN. 

